Glass.



if err onion.

OTTO sono'r'r, or JENA, GERMANY, ASSIGNOR'TO THE man or soHo'r'r & can;or 3mm, GERMANY.

Patented-1F nine 22, I915.

GLASS.

1 ,1L4l3,'?32, Specification of Letters Patent.

No Drawing.

To all whom it may concern Be it known that I, OTTO SoHoT'r, a citizenof the German Empire, residing at Jena, Germany, have invented a new anduseful Glass, of which the following is a specifica tion.

Further investigations regarding the glass Y. protected by Patent No.1,130,767 have shown,

that a glass capable of withstanding chemical influences may also beObtained, if the lime be wholly or in part replaced by magnesia, zincoxid or baryta, the proportions being so chosen that the place of a partby Wei ght of lime is always taken by an equivalent quantity ofone ofthe said substitute substances or of several of them. While no otherglass-forming components are employed for the new kind of glass, ofcourse the addition of a small quantity of one or more other substanceshaving some such secondary purpose as a coloring of the glass is notexcluded.

The following table contains six examples. Example I gives thecomposition of a kind of glass according to the above patent, whileexamples II to VI give the composition of new kinds of glass. All theexamples contain the same percentages respectively ofalkali, boracicacid and alumina; the 3% of lime of example I are replaced in example IIbythe equivalent quantity of magnesia (2.2% in example III by theequivalent quantity of Zinc oxid (4.3%) and in example IV by theequivalent quantity of In example V 2% of lime baryta (8.2% areretained, While 1% of lime is replaced by the equivalent quantity ofmagnesia Application filed December m, 19114:.v Seriai No. 876,556.

-' (0.7%), and in example VI the proportion of lime of example I isreplaced by magnesia and zinc oxid (1.1% and 2.1%). The proportion ofsilicic acid in examples II to VI is partly greater and partly less than111 "example I.

I II. III. IV. V VI. 1

Alkali....-. 13 13. 1s 13 13 12 'Boraoic acid 10 10 10 1O 10 10 ime 3 2Magnesia 2.2 0.7 1.1 Yincoxid 4.3 2.1 aryta .7 .2| Alumina 12 12 12 1212 12 Silicic acid 62 62 s 60.7 56.8 62.3 61.8

I claim:

Glass containing at least per cent.

silicic acid and having as its other glass.

that quantity of lime, which would represent the equivalent of thepercentages of'magnesia, zinc oxid and baryta being at least half and atmost five times that ofthe boracic acid and the total percentage ofmagnesia, zinc oxid and baryta being greater than zero.

OTTO SCHOTI. Witnesses:

PAUL KRUGER, RICHARD HAHN,

